export default{
	namespaced:true,
	
	state:()=>({
		//购物车的数组，用来存储购物车中每个商品的信息对象
		//每个商品的信息对象，都包含如下6个属性
		//{goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
		cart:JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	
	mutations:{
		addToCart(state,goods){
			//判断需要加入购物车的对象是否存在，不存在那么findResult为undefined
			const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
			
			if(!findResult){
				state.cart.push(goods)
			}
			else {
				findResult.goods_count++
			}
			
			this.commit('m_cart/saveToStorage')
		},
		saveToStorage(state){
			uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
		//更新购物车中商品的勾选状态
		updateGoodsState(state,goods){
			const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
			
			if(findResult){
				findResult.goods_state=goods.state
				this.commit('m_cart/saveToStorage')
			}
		},
		updateGoodsCount(state,goods){
			console.log("最终调用的函数")
			const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
			if(findResult){
				findResult.goods_count=goods.goods_count
				this.commit('m_cart/saveToStorage')
			}
		},
		removeGoodsById(state,goods_id){
			state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
			this.commit('m_cart/saveToStorage')
		},
		//更新购物车中所有商品的状态
		updateAllGoodsState(state,newState){
			state.cart.forEach(x=>x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		}
	},
	
	getters:{
		total(state){
			// let c=0
			// state.cart.forEach(x=>c+=x.goods_count)
			// return c
			
			return state.cart.reduce((total,item)=>total+=item.goods_count,0)
		},
		checkedCount(state){
			return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count,0)
		},
		//已勾选商品的总价格
		checkedGoodsAmount(state){
			return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count*item.goods_price,0).toFixed(2)
		}
	}
}